Spring-tooth harrow



(No Model.)

L. SWEET.

SPRING TOOTH HAROW.

No. 358,950. Patented Mar. 8, 1887.

IIIIi/I II||||||| INV NTOR Byzis .dttor I I /f/f WITNESSES UNITED STATESPATENT OFFICE.

LEBBEUS SVEET, OF VELLSVILLE, NFV YORK.

SPRING-TOOTH HARROW.

SPECIFICATION forming part of Letters Patent No. 358,950, dated ILarch8, 1887.

Application filed November 15, 1886.

To @ZZ whom it may concern:

Be it known that I, LEBBEUs SWEET, of VVellsville, Allegany county, NewYork, have invented an Improvement in Spring-Tooth Harrows, of which thefollowing is a specilication.

My invention relates specially to that class of. spring-tooth harrows inwhich curved arched spring barrow-teeth are secured upon one or moretransverse beams or tooth-bars. I refer to the general type of harrowshown in the reissued patent ot' Garver, No. 8,142, of

March 26, 1878.

|Ihe purpose of my invention is to provide an organization whereby theteeth may be adjusted with facility to raise and lower them or adjusttheir angle relatively to the soil. Various devices for this purposehave heretofore been patented.

In the accompanying drawings, Figure 1 is a view of a portion of atooth-bar with one spriug-tooth mounted thereon. Fig. 2 is a plan viewof the same with the tooth cut away. Fig. 3 is a side elevation with theharrow-tooth cut away. Fig. 4 is a detail View of the sliding block orshoe in which the tooth is secured, and Fig. 5 is a detail view of theclamp-bloek or lwasher which holds the tooth in its seat.

The tootlrbar A has a slot, a, cut in its upper face, either at rightangles or at any angle which may be desired, and in this slot a shoe, B,in which the harrowtooth C is seated, slides. The shoe or block B isformed with a central longitudinal slot, through which a bolt, b,passes. Ihe harrow-tooth is not slotted, but is merely provided with anaperture, c, through which the bolt b loosely passes. The upper end, c',of the harrow-tooth is curved, as illustrated, to conform in generaloutline to the curved upper face of the shoe. At each edge the shoe isprovided with vertical flanges b', between which the end of theharrow-tooth lies, and at the right-hand end, as viewed in Fig. 1,thereis a transverse slot, b2, in the shoe, which forms a continuationof the curved seat in which the end of the harrow-tooth lies, andthrough which the end of the tooth passes.

A washer or clamp-block, D, also provided with a longitudinal slot, isplaced over the end of the barrow-tooth, and the tooth-bar,

Serial No. 218,862. (No model.)

shoe, tooth, and clamp-block or washer may be clamped together by athumb-nut, E,

which works upon the upper end of the boltA b. The full lines in thedrawingsindicate the harrowtooth in one position-that is, with the pointraised farthest from the earth. By loosening the thumbnut and slidingthe shoe to the right, as viewed in the drawings, the upper end of thetooth will be depressed, so that the tooth will be thrown into theposition indicated by the dotted lines in Figs. 1 and 3. In thisadjustment, as will be obvious, there is no endwise movement ofthemupper end of the tooth, but it merely rocks upon the bolt b. Thetooth may readily be clamped in any position into which it may bethrown.

A washer, f, is preferably interposed between the clamp-blockand thethumb-nut.

rlhe means of adjustment above described may be employed in connectionwith any tooth having a curved upper end, whether it be a spring-toothor otherwise, and, so far as the scope of the invention is concerned, itis immaterial whether the end of the tooth and sliding shoe be locatedupon the under face of the beam or upon its upper face, as shown.

I am aware that a tooth holder or socket formed with a eountersink forthe reception of the curved end of a spring-tooth is old, and do notbroadly claim such subject-matter.

I claim as my invention- 1. The sliding shoe formed with a curved seat,in which the curved end of the harrowtooth rests, and a slotted endthrough which the barrow-tooth passes, in combination with a tooth-barand clamping devices, substanA tially as set forth.

2. The combination of the tooth-bar, a

the countersunk seat in the shoe, and clampro ing devices, for thepurpose set forth;

In testimony whereof I have hereunto subl scribed my name.

whereby the relation of the tooth to the soil is varied by the slidingof -the shoe and the tooth locked in any adjusted position.

4. The combination of a tooth-bar, atransverse]y-s1idingshoe, by themovement of which the relation of the barrow-tooth to the soil isVaried, the shoe being formed with a depressed or eountersunktooth-seat, :L spring harroW-tooth, the upper end of which lies inLEBBEUS SVEET.

W'i tn esses: Y

F. H. FURMAN, FRANK MACKEN.

